text: /*
   * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   *
   * This source code is subject to the terms of the BSD 2 Clause License and
   * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   * was not distributed with this source code in the LICENSE file, you can
   * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   * Media Patent License 1.0 was not distributed with this source code in the
   * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
   */
  
  #include <assert.h>
  
  #include "av1/common/common.h"
  #include "av1/common/entropy.h"
  #include "av1/common/entropymode.h"
  #include "av1/common/entropymv.h"
  #include "av1/common/mvref_common.h"
  #include "av1/common/pred_common.h"
  #include "av1/common/reconinter.h"
  #include "av1/common/seg_common.h"
  
  #include "av1/decoder/decodeframe.h"
  #include "av1/decoder/decodemv.h"
  
  #include "aom_dsp/aom_dsp_common.h"
  
  #define ACCT_STR __func__
  #if CONFIG_EXT_INTRA || CONFIG_FILTER_INTRA || CONFIG_PALETTE
  static INLINE int read_uniform(aom_reader *r, int n) {
    int l = get_unsigned_bits(n);
    int m = (1 << l) - n;
    int v = aom_read_literal(r, l - 1, ACCT_STR);
  
    assert(l != 0);
  
    if (v < m)
      return v;
    else
      return (v << 1) - m + aom_read_literal(r, 1, ACCT_STR);
  }
  #endif  // CONFIG_EXT_INTRA || CONFIG_FILTER_INTRA || CONFIG_PALETTE
  
  #if CONFIG_DAALA_EC
  static PREDICTION_MODE read_intra_mode(aom_reader *r, aom_cdf_prob *cdf) {
    return (PREDICTION_MODE)
        av1_intra_mode_inv[aom_read_symbol(r, cdf, INTRA_MODES, ACCT_STR)];
  }
  #else
  static PREDICTION_MODE read_intra_mode(aom_reader *r, const aom_prob *p) {
    return (PREDICTION_MODE)aom_read_tree(r, av1_intra_mode_tree, p, ACCT_STR);
  }
  #endif
  
  #if CONFIG_DELTA_Q
  static int read_delta_qindex(AV1_COMMON *cm, MACROBLOCKD *xd, aom_reader *r,
                               MB_MODE_INFO *const mbmi, int mi_col, int mi_row) {
    FRAME_COUNTS *counts = xd->counts;
    int sign, abs, reduced_delta_qindex = 0;
    BLOCK_SIZE bsize = mbmi->sb_type;
    const int b_col = mi_col & MAX_MIB_MASK;
    const int b_row = mi_row & MAX_MIB_MASK;
    const int read_delta_q_flag = (b_col == 0 && b_row == 0);
    int rem_bits, thr, bit = 1;
  
    if ((bsize != BLOCK_64X64 || mbmi->skip == 0) && read_delta_q_flag) {
      abs = 0;
      while (abs < DELTA_Q_SMALL && bit) {
        bit = aom_read(r, cm->fc->delta_q_prob[abs], ACCT_STR);
        if (counts) counts->delta_q[abs][bit]++;
        abs += bit;
      }
      if (abs == DELTA_Q_SMALL) {
        rem_bits = aom_read_literal(r, 3, ACCT_STR);
        thr = (1 << rem_bits) + 1;
        abs = aom_read_literal(r, rem_bits, ACCT_STR) + thr;
      }
  
      if (abs) {
        sign = aom_read_bit(r, ACCT_STR);
      } else {
        sign = 1;
      }
  
      reduced_delta_qindex = sign ? -abs : abs;
    }
    return reduced_delta_qindex;
  }
  #endif
  
  static PREDICTION_MODE read_intra_mode_y(AV1_COMMON *cm, MACROBLOCKD *xd,
                                           aom_reader *r, int size_group) {
    const PREDICTION_MODE y_mode =
  #if CONFIG_DAALA_EC
        read_intra_mode(r, cm->fc->y_mode_cdf[size_group]);
  #else
        read_intra_mode(r, cm->fc->y_mode_prob[size_group]);
  #endif
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->y_mode[size_group][y_mode];
    return y_mode;
  }
  
  static PREDICTION_MODE read_intra_mode_uv(AV1_COMMON *cm, MACROBLOCKD *xd,
                                            aom_reader *r,
                                            PREDICTION_MODE y_mode) {
    const PREDICTION_MODE uv_mode =
  #if CONFIG_DAALA_EC
        read_intra_mode(r, cm->fc->uv_mode_cdf[y_mode]);
  #else
        read_intra_mode(r, cm->fc->uv_mode_prob[y_mode]);
  #endif
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->uv_mode[y_mode][uv_mode];
    return uv_mode;
  }
  
  #if CONFIG_EXT_INTER
  static INTERINTRA_MODE read_interintra_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
                                              aom_reader *r, int size_group) {
    const INTERINTRA_MODE ii_mode = (INTERINTRA_MODE)aom_read_tree(
        r, av1_interintra_mode_tree, cm->fc->interintra_mode_prob[size_group],
        ACCT_STR);
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->interintra_mode[size_group][ii_mode];
    return ii_mode;
  }
  #endif  // CONFIG_EXT_INTER
  
  static PREDICTION_MODE read_inter_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
  #if CONFIG_REF_MV && CONFIG_EXT_INTER
                                         MB_MODE_INFO *mbmi,
  #endif
                                         aom_reader *r, int16_t ctx) {
  #if CONFIG_REF_MV
    FRAME_COUNTS *counts = xd->counts;
    int16_t mode_ctx = ctx & NEWMV_CTX_MASK;
    aom_prob mode_prob = cm->fc->newmv_prob[mode_ctx];
  
    if (aom_read(r, mode_prob, ACCT_STR) == 0) {
      if (counts) ++counts->newmv_mode[mode_ctx][0];
  
  #if CONFIG_EXT_INTER
      if (has_second_ref(mbmi)) {
  #endif  // CONFIG_EXT_INTER
        return NEWMV;
  #if CONFIG_EXT_INTER
      } else {
        mode_prob = cm->fc->new2mv_prob;
        if (aom_read(r, mode_prob, ACCT_STR) == 0) {
          if (counts) ++counts->new2mv_mode[0];
          return NEWMV;
        } else {
          if (counts) ++counts->new2mv_mode[1];
          return NEWFROMNEARMV;
        }
      }
  #endif  // CONFIG_EXT_INTER
    }
    if (counts) ++counts->newmv_mode[mode_ctx][1];
  
    if (ctx & (1 << ALL_ZERO_FLAG_OFFSET)) return ZEROMV;
  
    mode_ctx = (ctx >> ZEROMV_OFFSET) & ZEROMV_CTX_MASK;
  
    mode_prob = cm->fc->zeromv_prob[mode_ctx];
    if (aom_read(r, mode_prob, ACCT_STR) == 0) {
      if (counts) ++counts->zeromv_mode[mode_ctx][0];
      return ZEROMV;
    }
    if (counts) ++counts->zeromv_mode[mode_ctx][1];
  
    mode_ctx = (ctx >> REFMV_OFFSET) & REFMV_CTX_MASK;
  
    if (ctx & (1 << SKIP_NEARESTMV_OFFSET)) mode_ctx = 6;
    if (ctx & (1 << SKIP_NEARMV_OFFSET)) mode_ctx = 7;
    if (ctx & (1 << SKIP_NEARESTMV_SUB8X8_OFFSET)) mode_ctx = 8;
  
    mode_prob = cm->fc->refmv_prob[mode_ctx];
  
    if (aom_read(r, mode_prob, ACCT_STR) == 0) {
      if (counts) ++counts->refmv_mode[mode_ctx][0];
  
      return NEARESTMV;
    } else {
      if (counts) ++counts->refmv_mode[mode_ctx][1];
      return NEARMV;
    }
  
    // Invalid prediction mode.
    assert(0);
  #else
  #if CONFIG_DAALA_EC
    const int mode = av1_inter_mode_inv[aom_read_symbol(
        r, cm->fc->inter_mode_cdf[ctx], INTER_MODES, ACCT_STR)];
  #else
    const int mode = aom_read_tree(r, av1_inter_mode_tree,
                                   cm->fc->inter_mode_probs[ctx], ACCT_STR);
  #endif
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->inter_mode[ctx][mode];
  
    return NEARESTMV + mode;
  #endif
  }
  
  #if CONFIG_REF_MV
  static void read_drl_idx(const AV1_COMMON *cm, MACROBLOCKD *xd,
                           MB_MODE_INFO *mbmi, aom_reader *r) {
    uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
    mbmi->ref_mv_idx = 0;
  
    if (mbmi->mode == NEWMV) {
      int idx;
      for (idx = 0; idx < 2; ++idx) {
        if (xd->ref_mv_count[ref_frame_type] > idx + 1) {
          uint8_t drl_ctx = av1_drl_ctx(xd->ref_mv_stack[ref_frame_type], idx);
          aom_prob drl_prob = cm->fc->drl_prob[drl_ctx];
          if (!aom_read(r, drl_prob, ACCT_STR)) {
            mbmi->ref_mv_idx = idx;
            if (xd->counts) ++xd->counts->drl_mode[drl_ctx][0];
            return;
          }
          mbmi->ref_mv_idx = idx + 1;
          if (xd->counts) ++xd->counts->drl_mode[drl_ctx][1];
        }
      }
    }
  
    if (mbmi->mode == NEARMV) {
      int idx;
      // Offset the NEARESTMV mode.
      // TODO(jingning): Unify the two syntax decoding loops after the NEARESTMV
      // mode is factored in.
      for (idx = 1; idx < 3; ++idx) {
        if (xd->ref_mv_count[ref_frame_type] > idx + 1) {
          uint8_t drl_ctx = av1_drl_ctx(xd->ref_mv_stack[ref_frame_type], idx);
          aom_prob drl_prob = cm->fc->drl_prob[drl_ctx];
          if (!aom_read(r, drl_prob, ACCT_STR)) {
            mbmi->ref_mv_idx = idx - 1;
            if (xd->counts) ++xd->counts->drl_mode[drl_ctx][0];
            return;
          }
          mbmi->ref_mv_idx = idx;
          if (xd->counts) ++xd->counts->drl_mode[drl_ctx][1];
        }
      }
    }
  }
  #endif
  
  #if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
  static MOTION_MODE read_motion_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
                                      MB_MODE_INFO *mbmi, aom_reader *r) {
    if (is_motion_variation_allowed(mbmi)) {
      int motion_mode;
      FRAME_COUNTS *counts = xd->counts;
  
      motion_mode =
          aom_read_tree(r, av1_motion_mode_tree,
                        cm->fc->motion_mode_prob[mbmi->sb_type], ACCT_STR);
      if (counts) ++counts->motion_mode[mbmi->sb_type][motion_mode];
      return (MOTION_MODE)(SIMPLE_TRANSLATION + motion_mode);
    } else {
      return SIMPLE_TRANSLATION;
    }
  }
  #endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
  
  #if CONFIG_EXT_INTER
  static PREDICTION_MODE read_inter_compound_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
                                                  aom_reader *r, int16_t ctx) {
    const int mode =
        aom_read_tree(r, av1_inter_compound_mode_tree,
                      cm->fc->inter_compound_mode_probs[ctx], ACCT_STR);
    FRAME_COUNTS *counts = xd->counts;
  
    if (counts) ++counts->inter_compound_mode[ctx][mode];
  
    assert(is_inter_compound_mode(NEAREST_NEARESTMV + mode));
    return NEAREST_NEARESTMV + mode;
  }
  #endif  // CONFIG_EXT_INTER
  
  static int read_segment_id(aom_reader *r, struct segmentation_probs *segp) {
  #if CONFIG_DAALA_EC
    return aom_read_symbol(r, segp->tree_cdf, MAX_SEGMENTS, ACCT_STR);
  #else
    return aom_read_tree(r, av1_segment_tree, segp->tree_probs, ACCT_STR);
  #endif
  }
  
  #if CONFIG_VAR_TX
  static void read_tx_size_vartx(AV1_COMMON *cm, MACROBLOCKD *xd,
                                 MB_MODE_INFO *mbmi, FRAME_COUNTS *counts,
                                 TX_SIZE tx_size, int depth, int blk_row,
                                 int blk_col, aom_reader *r) {
    int is_split = 0;
    const int tx_row = blk_row >> 1;
    const int tx_col = blk_col >> 1;
    const int max_blocks_high = max_block_high(xd, mbmi->sb_type, 0);
    const int max_blocks_wide = max_block_wide(xd, mbmi->sb_type, 0);
    int ctx = txfm_partition_context(xd->above_txfm_context + tx_col,
                                     xd->left_txfm_context + tx_row,
                                     mbmi->sb_type, tx_size);
    TX_SIZE(*const inter_tx_size)
    [MAX_MIB_SIZE] =
        (TX_SIZE(*)[MAX_MIB_SIZE]) & mbmi->inter_tx_size[tx_row][tx_col];
    if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide) return;
  
    if (depth == MAX_VARTX_DEPTH) {
      int idx, idy;
      inter_tx_size[0][0] = tx_size;
      for (idy = 0; idy < tx_size_high_unit[tx_size] / 2; ++idy)
        for (idx = 0; idx < tx_size_wide_unit[tx_size] / 2; ++idx)
          inter_tx_size[idy][idx] = tx_size;
      mbmi->tx_size = tx_size;
      mbmi->min_tx_size = AOMMIN(mbmi->min_tx_size, get_min_tx_size(tx_size));
      if (counts) ++counts->txfm_partition[ctx][0];
      txfm_partition_update(xd->above_txfm_context + tx_col,
                            xd->left_txfm_context + tx_row, tx_size);
      return;
    }
  
    is_split = aom_read(r, cm->fc->txfm_partition_prob[ctx], ACCT_STR);
  
    if (is_split) {
      const TX_SIZE sub_txs = sub_tx_size_map[tx_size];
      const int bsl = tx_size_wide_unit[sub_txs];
      int i;
  
      if (counts) ++counts->txfm_partition[ctx][1];
  
      if (tx_size == TX_8X8) {
        inter_tx_size[0][0] = TX_4X4;
        mbmi->tx_size = TX_4X4;
        mbmi->min_tx_size = get_min_tx_size(mbmi->tx_size);
        txfm_partition_update(xd->above_txfm_context + tx_col,
                              xd->left_txfm_context + tx_row, TX_4X4);
        return;
      }
  
      assert(bsl > 0);
      for (i = 0; i < 4; ++i) {
        int offsetr = blk_row + (i >> 1) * bsl;
        int offsetc = blk_col + (i & 0x01) * bsl;
        read_tx_size_vartx(cm, xd, mbmi, counts, sub_txs, depth + 1, offsetr,
                           offsetc, r);
      }
    } else {
      int idx, idy;
      inter_tx_size[0][0] = tx_size;
      for (idy = 0; idy < tx_size_high_unit[tx_size] / 2; ++idy)
        for (idx = 0; idx < tx_size_wide_unit[tx_size] / 2; ++idx)
          inter_tx_size[idy][idx] = tx_size;
      mbmi->tx_size = tx_size;
      mbmi->min_tx_size = AOMMIN(mbmi->min_tx_size, get_min_tx_size(tx_size));
      if (counts) ++counts->txfm_partition[ctx][0];
      txfm_partition_update(xd->above_txfm_context + tx_col,
                            xd->left_txfm_context + tx_row, tx_size);
    }
  }
  #endif
  
  static TX_SIZE read_selected_tx_size(AV1_COMMON *cm, MACROBLOCKD *xd,
                                       int tx_size_cat, aom_reader *r) {
    FRAME_COUNTS *counts = xd->counts;
    const int ctx = get_tx_size_context(xd);
    int depth = aom_read_tree(r, av1_tx_size_tree[tx_size_cat],
                              cm->fc->tx_size_probs[tx_size_cat][ctx], ACCT_STR);
    TX_SIZE tx_size = depth_to_tx_size(depth);
    if (counts) ++counts->tx_size[tx_size_cat][ctx][depth];
    return tx_size;
  }
  
  static TX_SIZE read_tx_size_intra(AV1_COMMON *cm, MACROBLOCKD *xd,
                                    aom_reader *r) {
    TX_MODE tx_mode = cm->tx_mode;
    BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
    if (xd->lossless[xd->mi[0]->mbmi.segment_id]) return TX_4X4;
    if (bsize >= BLOCK_8X8) {
      if (tx_mode == TX_MODE_SELECT) {
        const TX_SIZE tx_size =
            read_selected_tx_size(cm, xd, intra_tx_size_cat_lookup[bsize], r);
        assert(tx_size <= max_txsize_lookup[bsize]);
        return tx_size;
      } else {
        return tx_size_from_tx_mode(bsize, cm->tx_mode, 0);
      }
    } else {
      return TX_4X4;
    }
  }
  
  static TX_SIZE read_tx_size_inter(AV1_COMMON *cm, MACROBLOCKD *xd,
                                    int allow_select, aom_reader *r) {
    TX_MODE tx_mode = cm->tx_mode;
    BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
    if (xd->lossless[xd->mi[0]->mbmi.segment_id]) return TX_4X4;
    if (bsize >= BLOCK_8X8) {
      if (allow_select && tx_mode == TX_MODE_SELECT) {
        const TX_SIZE coded_tx_size =
            read_selected_tx_size(cm, xd, inter_tx_size_cat_lookup[bsize], r);
  #if CONFIG_EXT_TX && CONFIG_RECT_TX
        if (coded_tx_size > max_txsize_lookup[bsize]) {
          assert(coded_tx_size == max_txsize_lookup[bsize] + 1);
          return max_txsize_rect_lookup[bsize];
        }
  #else
        assert(coded_tx_size <= max_txsize_lookup[bsize]);
  #endif  // CONFIG_EXT_TX && CONFIG_RECT_TX
        return coded_tx_size;
      } else {
        return tx_size_from_tx_mode(bsize, cm->tx_mode, 1);
      }
    } else {
  #if CONFIG_EXT_TX && CONFIG_RECT_TX
      assert(IMPLIES(tx_mode == ONLY_4X4, bsize == BLOCK_4X4));
      return max_txsize_rect_lookup[bsize];
  #else
      return TX_4X4;
  #endif
    }
  }
  
  static int dec_get_segment_id(const AV1_COMMON *cm, const uint8_t *segment_ids,
                                int mi_offset, int x_mis, int y_mis) {
    int x, y, segment_id = INT_MAX;
  
    for (y = 0; y < y_mis; y++)
      for (x = 0; x < x_mis; x++)
        segment_id =
            AOMMIN(segment_id, segment_ids[mi_offset + y * cm->mi_cols + x]);
  
    assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
    return segment_id;
  }
  
  static void set_segment_id(AV1_COMMON *cm, int mi_offset, int x_mis, int y_mis,
                             int segment_id) {
    int x, y;
  
    assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
  
    for (y = 0; y < y_mis; y++)
      for (x = 0; x < x_mis; x++)
        cm->current_frame_seg_map[mi_offset + y * cm->mi_cols + x] = segment_id;
  }
  
  static int read_intra_segment_id(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                   int mi_offset, int x_mis, int y_mis,
                                   aom_reader *r) {
    struct segmentation *const seg = &cm->seg;
    FRAME_COUNTS *counts = xd->counts;
    struct segmentation_probs *const segp = &cm->fc->seg;
    int segment_id;
  
    if (!seg->enabled) return 0;  // Default for disabled segmentation
  
    assert(seg->update_map && !seg->temporal_update);
  
    segment_id = read_segment_id(r, segp);
    if (counts) ++counts->seg.tree_total[segment_id];
    set_segment_id(cm, mi_offset, x_mis, y_mis, segment_id);
    return segment_id;
  }
  
  static void copy_segment_id(const AV1_COMMON *cm,
                              const uint8_t *last_segment_ids,
                              uint8_t *current_segment_ids, int mi_offset,
                              int x_mis, int y_mis) {
    int x, y;
  
    for (y = 0; y < y_mis; y++)
      for (x = 0; x < x_mis; x++)
        current_segment_ids[mi_offset + y * cm->mi_cols + x] =
            last_segment_ids ? last_segment_ids[mi_offset + y * cm->mi_cols + x]
                             : 0;
  }
  
  static int read_inter_segment_id(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                   int mi_row, int mi_col, aom_reader *r) {
    struct segmentation *const seg = &cm->seg;
    FRAME_COUNTS *counts = xd->counts;
    struct segmentation_probs *const segp = &cm->fc->seg;
    MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
    int predicted_segment_id, segment_id;
    const int mi_offset = mi_row * cm->mi_cols + mi_col;
    const int bw = num_8x8_blocks_wide_lookup[mbmi->sb_type];
    const int bh = num_8x8_blocks_high_lookup[mbmi->sb_type];
  
    // TODO(slavarnway): move x_mis, y_mis into xd ?????
    const int x_mis = AOMMIN(cm->mi_cols - mi_col, bw);
    const int y_mis = AOMMIN(cm->mi_rows - mi_row, bh);
  
    if (!seg->enabled) return 0;  // Default for disabled segmentation
  
    predicted_segment_id = cm->last_frame_seg_map
                               ? dec_get_segment_id(cm, cm->last_frame_seg_map,
                                                    mi_offset, x_mis, y_mis)
                               : 0;
  
    if (!seg->update_map) {
      copy_segment_id(cm, cm->last_frame_seg_map, cm->current_frame_seg_map,
                      mi_offset, x_mis, y_mis);
      return predicted_segment_id;
    }
  
    if (seg->temporal_update) {
      const int ctx = av1_get_pred_context_seg_id(xd);
      const aom_prob pred_prob = segp->pred_probs[ctx];
      mbmi->seg_id_predicted = aom_read(r, pred_prob, ACCT_STR);
      if (counts) ++counts->seg.pred[ctx][mbmi->seg_id_predicted];
      if (mbmi->seg_id_predicted) {
        segment_id = predicted_segment_id;
      } else {
        segment_id = read_segment_id(r, segp);
        if (counts) ++counts->seg.tree_mispred[segment_id];
      }
    } else {
      segment_id = read_segment_id(r, segp);
      if (counts) ++counts->seg.tree_total[segment_id];
    }
    set_segment_id(cm, mi_offset, x_mis, y_mis, segment_id);
    return segment_id;
  }
  
  static int read_skip(AV1_COMMON *cm, const MACROBLOCKD *xd, int segment_id,
                       aom_reader *r) {
    if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
      return 1;
    } else {
      const int ctx = av1_get_skip_context(xd);
      const int skip = aom_read(r, cm->fc->skip_probs[ctx], ACCT_STR);
      FRAME_COUNTS *counts = xd->counts;
      if (counts) ++counts->skip[ctx][skip];
      return skip;
    }
  }
  
  #if CONFIG_PALETTE
  static void read_palette_mode_info(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                     aom_reader *r) {
    MODE_INFO *const mi = xd->mi[0];
    MB_MODE_INFO *const mbmi = &mi->mbmi;
    const MODE_INFO *const above_mi = xd->above_mi;
    const MODE_INFO *const left_mi = xd->left_mi;
    const BLOCK_SIZE bsize = mbmi->sb_type;
    int i, n, palette_ctx = 0;
    PALETTE_MODE_INFO *const pmi = &mbmi->palette_mode_info;
  
    if (mbmi->mode == DC_PRED) {
      if (above_mi)
        palette_ctx += (above_mi->mbmi.palette_mode_info.palette_size[0] > 0);
      if (left_mi)
        palette_ctx += (left_mi->mbmi.palette_mode_info.palette_size[0] > 0);
      if (aom_read(
              r, av1_default_palette_y_mode_prob[bsize - BLOCK_8X8][palette_ctx],
              ACCT_STR)) {
        pmi->palette_size[0] =
            aom_read_tree(r, av1_palette_size_tree,
                          av1_default_palette_y_size_prob[bsize - BLOCK_8X8],
                          ACCT_STR) +
            2;
        n = pmi->palette_size[0];
        for (i = 0; i < n; ++i)
          pmi->palette_colors[i] = aom_read_literal(r, cm->bit_depth, ACCT_STR);
  
        xd->plane[0].color_index_map[0] = read_uniform(r, n);
        assert(xd->plane[0].color_index_map[0] < n);
      }
    }
  
    if (mbmi->uv_mode == DC_PRED) {
      if (aom_read(r, av1_default_palette_uv_mode_prob[pmi->palette_size[0] > 0],
                   ACCT_STR)) {
        pmi->palette_size[1] =
            aom_read_tree(r, av1_palette_size_tree,
                          av1_default_palette_uv_size_prob[bsize - BLOCK_8X8],
                          ACCT_STR) +
            2;
        n = pmi->palette_size[1];
        for (i = 0; i < n; ++i) {
          pmi->palette_colors[PALETTE_MAX_SIZE + i] =
              aom_read_literal(r, cm->bit_depth, ACCT_STR);
          pmi->palette_colors[2 * PALETTE_MAX_SIZE + i] =
              aom_read_literal(r, cm->bit_depth, ACCT_STR);
        }
        xd->plane[1].color_index_map[0] = read_uniform(r, n);
        assert(xd->plane[1].color_index_map[0] < n);
      }
    }
  }
  #endif  // CONFIG_PALETTE
  
  #if CONFIG_FILTER_INTRA
  static void read_filter_intra_mode_info(AV1_COMMON *const cm,
                                          MACROBLOCKD *const xd, aom_reader *r) {
    MODE_INFO *const mi = xd->mi[0];
    MB_MODE_INFO *const mbmi = &mi->mbmi;
    FRAME_COUNTS *counts = xd->counts;
    FILTER_INTRA_MODE_INFO *filter_intra_mode_info =
        &mbmi->filter_intra_mode_info;
  
    if (mbmi->mode == DC_PRED
  #if CONFIG_PALETTE
        && mbmi->palette_mode_info.palette_size[0] == 0
  #endif  // CONFIG_PALETTE
        ) {
      filter_intra_mode_info->use_filter_intra_mode[0] =
          aom_read(r, cm->fc->filter_intra_probs[0], ACCT_STR);
      if (filter_intra_mode_info->use_filter_intra_mode[0]) {
        filter_intra_mode_info->filter_intra_mode[0] =
            read_uniform(r, FILTER_INTRA_MODES);
      }
      if (counts) {
        ++counts->filter_intra[0]
                              [filter_intra_mode_info->use_filter_intra_mode[0]];
      }
    }
    if (mbmi->uv_mode == DC_PRED
  #if CONFIG_PALETTE
        && mbmi->palette_mode_info.palette_size[1] == 0
  #endif  // CONFIG_PALETTE
        ) {
      filter_intra_mode_info->use_filter_intra_mode[1] =
          aom_read(r, cm->fc->filter_intra_probs[1], ACCT_STR);
      if (filter_intra_mode_info->use_filter_intra_mode[1]) {
        filter_intra_mode_info->filter_intra_mode[1] =
            read_uniform(r, FILTER_INTRA_MODES);
      }
      if (counts) {
        ++counts->filter_intra[1]
                              [filter_intra_mode_info->use_filter_intra_mode[1]];
      }
    }
  }
  #endif  // CONFIG_FILTER_INTRA
  
  #if CONFIG_EXT_INTRA
  static void read_intra_angle_info(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                    aom_reader *r) {
    MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
    const BLOCK_SIZE bsize = mbmi->sb_type;
    const int ctx = av1_get_pred_context_intra_interp(xd);
    int p_angle;
  
    if (bsize < BLOCK_8X8) return;
  
    if (mbmi->mode != DC_PRED && mbmi->mode != TM_PRED) {
      mbmi->angle_delta[0] =
          read_uniform(r, 2 * MAX_ANGLE_DELTAS + 1) - MAX_ANGLE_DELTAS;
      p_angle = mode_to_angle_map[mbmi->mode] + mbmi->angle_delta[0] * ANGLE_STEP;
      if (av1_is_intra_filter_switchable(p_angle)) {
        FRAME_COUNTS *counts = xd->counts;
        mbmi->intra_filter = aom_read_tree(
            r, av1_intra_filter_tree, cm->fc->intra_filter_probs[ctx], ACCT_STR);
        if (counts) ++counts->intra_filter[ctx][mbmi->intra_filter];
      } else {
        mbmi->intra_filter = INTRA_FILTER_LINEAR;
      }
    }
  
    if (mbmi->uv_mode != DC_PRED && mbmi->uv_mode != TM_PRED) {
      mbmi->angle_delta[1] =
          read_uniform(r, 2 * MAX_ANGLE_DELTAS + 1) - MAX_ANGLE_DELTAS;
    }
  }
  #endif  // CONFIG_EXT_INTRA
  
  static void read_tx_type(const AV1_COMMON *const cm, MACROBLOCKD *xd,
                           MB_MODE_INFO *mbmi,
  #if CONFIG_SUPERTX
                           int supertx_enabled,
  #endif
                           aom_reader *r) {
    const int inter_block = is_inter_block(mbmi);
  #if CONFIG_VAR_TX
    const TX_SIZE tx_size = inter_block ? mbmi->min_tx_size : mbmi->tx_size;
  #else
    const TX_SIZE tx_size = mbmi->tx_size;
  #endif
    if (!FIXED_TX_TYPE) {
  #if CONFIG_EXT_TX
      if (get_ext_tx_types(tx_size, mbmi->sb_type, inter_block) > 1 &&
          cm->base_qindex > 0 && !mbmi->skip &&
  #if CONFIG_SUPERTX
          !supertx_enabled &&
  #endif  // CONFIG_SUPERTX
          !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
        int eset = get_ext_tx_set(tx_size, mbmi->sb_type, inter_block);
        FRAME_COUNTS *counts = xd->counts;
  
        if (inter_block) {
          if (eset > 0) {
            mbmi->tx_type = aom_read_tree(
                r, av1_ext_tx_inter_tree[eset],
                cm->fc->inter_ext_tx_prob[eset][txsize_sqr_map[tx_size]],
                ACCT_STR);
            if (counts)
              ++counts->inter_ext_tx[eset][txsize_sqr_map[tx_size]]
                                    [mbmi->tx_type];
          }
        } else if (ALLOW_INTRA_EXT_TX) {
          if (eset > 0) {
            mbmi->tx_type = aom_read_tree(
                r, av1_ext_tx_intra_tree[eset],
                cm->fc->intra_ext_tx_prob[eset][tx_size][mbmi->mode], ACCT_STR);
            if (counts)
              ++counts->intra_ext_tx[eset][tx_size][mbmi->mode][mbmi->tx_type];
          }
        }
      } else {
        mbmi->tx_type = DCT_DCT;
      }
  #else
      if (tx_size < TX_32X32 && cm->base_qindex > 0 && !mbmi->skip &&
  #if CONFIG_SUPERTX
          !supertx_enabled &&
  #endif  // CONFIG_SUPERTX
          !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
        FRAME_COUNTS *counts = xd->counts;
        if (inter_block) {
  #if CONFIG_DAALA_EC
          mbmi->tx_type = av1_ext_tx_inv[aom_read_symbol(
              r, cm->fc->inter_ext_tx_cdf[tx_size], TX_TYPES, ACCT_STR)];
  #else
          mbmi->tx_type = aom_read_tree(
              r, av1_ext_tx_tree, cm->fc->inter_ext_tx_prob[tx_size], ACCT_STR);
  #endif
          if (counts) ++counts->inter_ext_tx[tx_size][mbmi->tx_type];
        } else {
          const TX_TYPE tx_type_nom = intra_mode_to_tx_type_context[mbmi->mode];
  #if CONFIG_DAALA_EC
          mbmi->tx_type = av1_ext_tx_inv[aom_read_symbol(
              r, cm->fc->intra_ext_tx_cdf[tx_size][tx_type_nom], TX_TYPES,
              ACCT_STR)];
  #else
          mbmi->tx_type = aom_read_tree(
              r, av1_ext_tx_tree, cm->fc->intra_ext_tx_prob[tx_size][tx_type_nom],
              ACCT_STR);
  #endif
          if (counts) ++counts->intra_ext_tx[tx_size][tx_type_nom][mbmi->tx_type];
        }
      } else {
        mbmi->tx_type = DCT_DCT;
      }
  #endif  // CONFIG_EXT_TX
    }
  }
  
  static void read_intra_frame_mode_info(AV1_COMMON *const cm,
                                         MACROBLOCKD *const xd, int mi_row,
                                         int mi_col, aom_reader *r) {
    MODE_INFO *const mi = xd->mi[0];
    MB_MODE_INFO *const mbmi = &mi->mbmi;
    const MODE_INFO *above_mi = xd->above_mi;
    const MODE_INFO *left_mi = xd->left_mi;
    const BLOCK_SIZE bsize = mbmi->sb_type;
    int i;
    const int mi_offset = mi_row * cm->mi_cols + mi_col;
    const int bw = xd->plane[0].n4_w >> 1;
    const int bh = xd->plane[0].n4_h >> 1;
  
    // TODO(slavarnway): move x_mis, y_mis into xd ?????
    const int x_mis = AOMMIN(cm->mi_cols - mi_col, bw);
    const int y_mis = AOMMIN(cm->mi_rows - mi_row, bh);
  
    mbmi->segment_id = read_intra_segment_id(cm, xd, mi_offset, x_mis, y_mis, r);
    mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);
  
  #if CONFIG_DELTA_Q
    if (cm->delta_q_present_flag) {
      xd->current_qindex =
          xd->prev_qindex +
          read_delta_qindex(cm, xd, r, mbmi, mi_col, mi_row) * cm->delta_q_res;
      xd->prev_qindex = xd->current_qindex;
    }
  #endif
  
    mbmi->tx_size = read_tx_size_intra(cm, xd, r);
    mbmi->ref_frame[0] = INTRA_FRAME;
    mbmi->ref_frame[1] = NONE;
  
    switch (bsize) {
      case BLOCK_4X4:
        for (i = 0; i < 4; ++i)
          mi->bmi[i].as_mode =
  #if CONFIG_DAALA_EC
              read_intra_mode(r, get_y_mode_cdf(cm, mi, above_mi, left_mi, i));
  #else
              read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, i));
  #endif
        mbmi->mode = mi->bmi[3].as_mode;
        break;
      case BLOCK_4X8:
        mi->bmi[0].as_mode = mi->bmi[2].as_mode =
  #if CONFIG_DAALA_EC
            read_intra_mode(r, get_y_mode_cdf(cm, mi, above_mi, left_mi, 0));
  #else
            read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
  #endif
        mi->bmi[1].as_mode = mi->bmi[3].as_mode = mbmi->mode =
  #if CONFIG_DAALA_EC
            read_intra_mode(r, get_y_mode_cdf(cm, mi, above_mi, left_mi, 1));
  #else
            read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 1));
  #endif
        break;
      case BLOCK_8X4:
        mi->bmi[0].as_mode = mi->bmi[1].as_mode =
  #if CONFIG_DAALA_EC
            read_intra_mode(r, get_y_mode_cdf(cm, mi, above_mi, left_mi, 0));
  #else
            read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
  #endif
        mi->bmi[2].as_mode = mi->bmi[3].as_mode = mbmi->mode =
  #if CONFIG_DAALA_EC
            read_intra_mode(r, get_y_mode_cdf(cm, mi, above_mi, left_mi, 2));
  #else
            read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 2));
  #endif
        break;
      default:
        mbmi->mode =
  #if CONFIG_DAALA_EC
            read_intra_mode(r, get_y_mode_cdf(cm, mi, above_mi, left_mi, 0));
  #else
            read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
  #endif
    }
  
    mbmi->uv_mode = read_intra_mode_uv(cm, xd, r, mbmi->mode);
  #if CONFIG_EXT_INTRA
    read_intra_angle_info(cm, xd, r);
  #endif  // CONFIG_EXT_INTRA
  #if CONFIG_PALETTE
    mbmi->palette_mode_info.palette_size[0] = 0;
    mbmi->palette_mode_info.palette_size[1] = 0;
    if (bsize >= BLOCK_8X8 && cm->allow_screen_content_tools)
      read_palette_mode_info(cm, xd, r);
  #endif  // CONFIG_PALETTE
  #if CONFIG_FILTER_INTRA
    mbmi->filter_intra_mode_info.use_filter_intra_mode[0] = 0;
    mbmi->filter_intra_mode_info.use_filter_intra_mode[1] = 0;
    if (bsize >= BLOCK_8X8) read_filter_intra_mode_info(cm, xd, r);
  #endif  // CONFIG_FILTER_INTRA
  
    read_tx_type(cm, xd, mbmi,
  #if CONFIG_SUPERTX
                 0,
  #endif
                 r);
  }
  
  static int read_mv_component(aom_reader *r, nmv_component *mvcomp, int usehp) {
    int mag, d, fr, hp;
    const int sign = aom_read(r, mvcomp->sign, ACCT_STR);
    const int mv_class =
  #if CONFIG_EC_MULTISYMBOL
        aom_read_symbol(r, mvcomp->class_cdf, MV_CLASSES, ACCT_STR);
  #else
        aom_read_tree(r, av1_mv_class_tree, mvcomp->classes, ACCT_STR);
  #endif
    const int class0 = mv_class == MV_CLASS_0;
  
    // Integer part
    if (class0) {
      d = aom_read(r, mvcomp->class0[0], ACCT_STR);
      mag = 0;
    } else {
      int i;
      const int n = mv_class + CLASS0_BITS - 1;  // number of bits
  
      d = 0;
      for (i = 0; i < n; ++i) d |= aom_read(r, mvcomp->bits[i], ACCT_STR) << i;
      mag = CLASS0_SIZE << (mv_class + 2);
    }
  
  // Fractional part
  #if CONFIG_EC_MULTISYMBOL
    fr = aom_read_symbol(r, class0 ? mvcomp->class0_fp_cdf[d] : mvcomp->fp_cdf,
                         MV_FP_SIZE, ACCT_STR);
  #else
    fr = aom_read_tree(r, av1_mv_fp_tree,
                       class0 ? mvcomp->class0_fp[d] : mvcomp->fp, ACCT_STR);
  #endif
  
    // High precision part (if hp is not used, the default value of the hp is 1)
    hp = usehp ? aom_read(r, class0 ? mvcomp->class0_hp : mvcomp->hp, ACCT_STR)
               : 1;
  
    // Result
    mag += ((d << 3) | (fr << 1) | hp) + 1;
    return sign ? -mag : mag;
  }
  
  static INLINE void read_mv(aom_reader *r, MV *mv, const MV *ref,
                             nmv_context *ctx, nmv_context_counts *counts,
                             int allow_hp) {
    MV_JOINT_TYPE joint_type;
    MV diff = { 0, 0 };
    joint_type =
  #if CONFIG_EC_MULTISYMBOL
        (MV_JOINT_TYPE)aom_read_symbol(r, ctx->joint_cdf, MV_JOINTS, ACCT_STR);
  #else
        (MV_JOINT_TYPE)aom_read_tree(r, av1_mv_joint_tree, ctx->joints, ACCT_STR);
  #endif
  
    if (mv_joint_vertical(joint_type))
      diff.row = read_mv_component(r, &ctx->comps[0], allow_hp);
  
    if (mv_joint_horizontal(joint_type))
      diff.col = read_mv_component(r, &ctx->comps[1], allow_hp);
  
    av1_inc_mv(&diff, counts, allow_hp);
  
    mv->row = ref->row + diff.row;
    mv->col = ref->col + diff.col;
  }
  
  static REFERENCE_MODE read_block_reference_mode(AV1_COMMON *cm,
                                                  const MACROBLOCKD *xd,
                                                  aom_reader *r) {
    if (cm->reference_mode == REFERENCE_MODE_SELECT) {
      const int ctx = av1_get_reference_mode_context(cm, xd);
      const REFERENCE_MODE mode =
          (REFERENCE_MODE)aom_read(r, cm->fc->comp_inter_prob[ctx], ACCT_STR);
      FRAME_COUNTS *counts = xd->counts;
      if (counts) ++counts->comp_inter[ctx][mode];
      return mode;  // SINGLE_REFERENCE or COMPOUND_REFERENCE
    } else {
      return cm->reference_mode;
    }
  }
  
  // Read the referncence frame
  static void read_ref_frames(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                              aom_reader *r, int segment_id,
                              MV_REFERENCE_FRAME ref_frame[2]) {
    FRAME_CONTEXT *const fc = cm->fc;
    FRAME_COUNTS *counts = xd->counts;
  
    if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
      ref_frame[0] = (MV_REFERENCE_FRAME)get_segdata(&cm->seg, segment_id,
                                                     SEG_LVL_REF_FRAME);
      ref_frame[1] = NONE;
    } else {
      const REFERENCE_MODE mode = read_block_reference_mode(cm, xd, r);
      // FIXME(rbultje) I'm pretty sure this breaks segmentation ref frame coding
      if (mode == COMPOUND_REFERENCE) {
  #if CONFIG_EXT_REFS
        const int idx = cm->ref_frame_sign_bias[cm->comp_bwd_ref[0]];
  #else
        const int idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
  #endif  // CONFIG_EXT_REFS
        const int ctx = av1_get_pred_context_comp_ref_p(cm, xd);
        const int bit = aom_read(r, fc->comp_ref_prob[ctx][0], ACCT_STR);
  
        if (counts) ++counts->comp_ref[ctx][0][bit];
  
  #if CONFIG_EXT_REFS
        // Decode forward references.
        if (!bit) {
          const int ctx1 = av1_get_pred_context_comp_ref_p1(cm, xd);
          const int bit1 = aom_read(r, fc->comp_ref_prob[ctx1][1], ACCT_STR);
          if (counts) ++counts->comp_ref[ctx1][1][bit1];
          ref_frame[!idx] = cm->comp_fwd_ref[bit1 ? 0 : 1];
        } else {
          const int ctx2 = av1_get_pred_context_comp_ref_p2(cm, xd);
          const int bit2 = aom_read(r, fc->comp_ref_prob[ctx2][2], ACCT_STR);
          if (counts) ++counts->comp_ref[ctx2][2][bit2];
          ref_frame[!idx] = cm->comp_fwd_ref[bit2 ? 3 : 2];
        }
  
        // Decode backward references.
        {
          const int ctx_bwd = av1_get_pred_context_comp_bwdref_p(cm, xd);
          const int bit_bwd =
              aom_read(r, fc->comp_bwdref_prob[ctx_bwd][0], ACCT_STR);
          if (counts) ++counts->comp_bwdref[ctx_bwd][0][bit_bwd];
          ref_frame[idx] = cm->comp_bwd_ref[bit_bwd];
        }
  #else
        ref_frame[!idx] = cm->comp_var_ref[bit];
        ref_frame[idx] = cm->comp_fixed_ref;
  #endif  // CONFIG_EXT_REFS
      } else if (mode == SINGLE_REFERENCE) {
  #if CONFIG_EXT_REFS
        const int ctx0 = av1_get_pred_context_single_ref_p1(xd);
        const int bit0 = aom_read(r, fc->single_ref_prob[ctx0][0], ACCT_STR);
        if (counts) ++counts->single_ref[ctx0][0][bit0];
  
        if (bit0) {
          const int ctx1 = av1_get_pred_context_single_ref_p2(xd);
          const int bit1 = aom_read(r, fc->single_ref_prob[ctx1][1], ACCT_STR);
          if (counts) ++counts->single_ref[ctx1][1][bit1];
          ref_frame[0] = bit1 ? ALTREF_FRAME : BWDREF_FRAME;
        } else {
          const int ctx2 = av1_get_pred_context_single_ref_p3(xd);
          const int bit2 = aom_read(r, fc->single_ref_prob[ctx2][2], ACCT_STR);
          if (counts) ++counts->single_ref[ctx2][2][bit2];
          if (bit2) {
            const int ctx4 = av1_get_pred_context_single_ref_p5(xd);
            const int bit4 = aom_read(r, fc->single_ref_prob[ctx4][4], ACCT_STR);
            if (counts) ++counts->single_ref[ctx4][4][bit4];
            ref_frame[0] = bit4 ? GOLDEN_FRAME : LAST3_FRAME;
          } else {
            const int ctx3 = av1_get_pred_context_single_ref_p4(xd);
            const int bit3 = aom_read(r, fc->single_ref_prob[ctx3][3], ACCT_STR);
            if (counts) ++counts->single_ref[ctx3][3][bit3];
            ref_frame[0] = bit3 ? LAST2_FRAME : LAST_FRAME;
          }
        }
  #else
        const int ctx0 = av1_get_pred_context_single_ref_p1(xd);
        const int bit0 = aom_read(r, fc->single_ref_prob[ctx0][0], ACCT_STR);
        if (counts) ++counts->single_ref[ctx0][0][bit0];
  
        if (bit0) {
          const int ctx1 = av1_get_pred_context_single_ref_p2(xd);
          const int bit1 = aom_read(r, fc->single_ref_prob[ctx1][1], ACCT_STR);
          if (counts) ++counts->single_ref[ctx1][1][bit1];
          ref_frame[0] = bit1 ? ALTREF_FRAME : GOLDEN_FRAME;
        } else {
          ref_frame[0] = LAST_FRAME;
        }
  #endif  // CONFIG_EXT_REFS
  
        ref_frame[1] = NONE;
      } else {
        assert(0 && "Invalid prediction mode.");
      }
    }
  }
  
  static INLINE InterpFilter read_interp_filter(AV1_COMMON *const cm,
                                                MACROBLOCKD *const xd,
  #if CONFIG_DUAL_FILTER
                                                int dir,
  #endif
                                                aom_reader *r) {
  #if CONFIG_EXT_INTERP
    if (!av1_is_interp_needed(xd)) return EIGHTTAP_REGULAR;
  #endif
    if (cm->interp_filter != SWITCHABLE) {
      return cm->interp_filter;
    } else {
  #if CONFIG_DUAL_FILTER
      const int ctx = av1_get_pred_context_switchable_interp(xd, dir);
  #else
      const int ctx = av1_get_pred_context_switchable_interp(xd);
  #endif
      FRAME_COUNTS *counts = xd->counts;
  #if CONFIG_DAALA_EC
      const InterpFilter type =
          (InterpFilter)av1_switchable_interp_inv[aom_read_symbol(
              r, cm->fc->switchable_interp_cdf[ctx], SWITCHABLE_FILTERS,
              ACCT_STR)];
  #else
      const InterpFilter type = (InterpFilter)aom_read_tree(
          r, av1_switchable_interp_tree, cm->fc->switchable_interp_prob[ctx],
          ACCT_STR);
  #endif
      if (counts) ++counts->switchable_interp[ctx][type];
      return type;
    }
  }
  
  static void read_intra_block_mode_info(AV1_COMMON *const cm,
                                         MACROBLOCKD *const xd, MODE_INFO *mi,
                                         aom_reader *r) {
    MB_MODE_INFO *const mbmi = &mi->mbmi;
    const BLOCK_SIZE bsize = mi->mbmi.sb_type;
    int i;
  
    mbmi->ref_frame[0] = INTRA_FRAME;
    mbmi->ref_frame[1] = NONE;
  
    switch (bsize) {
      case BLOCK_4X4:
        for (i = 0; i < 4; ++i)
          mi->bmi[i].as_mode = read_intra_mode_y(cm, xd, r, 0);
        mbmi->mode = mi->bmi[3].as_mode;
        break;
      case BLOCK_4X8:
        mi->bmi[0].as_mode = mi->bmi[2].as_mode = read_intra_mode_y(cm, xd, r, 0);
        mi->bmi[1].as_mode = mi->bmi[3].as_mode = mbmi->mode =
            read_intra_mode_y(cm, xd, r, 0);
        break;
      case BLOCK_8X4:
        mi->bmi[0].as_mode = mi->bmi[1].as_mode = read_intra_mode_y(cm, xd, r, 0);
        mi->bmi[2].as_mode = mi->bmi[3].as_mode = mbmi->mode =
            read_intra_mode_y(cm, xd, r, 0);
        break;
      default:
        mbmi->mode = read_intra_mode_y(cm, xd, r, size_group_lookup[bsize]);
    }
  
    mbmi->uv_mode = read_intra_mode_uv(cm, xd, r, mbmi->mode);
  #if CONFIG_EXT_INTRA
    read_intra_angle_info(cm, xd, r);
  #endif  // CONFIG_EXT_INTRA
  #if CONFIG_PALETTE
    mbmi->palette_mode_info.palette_size[0] = 0;
    mbmi->palette_mode_info.palette_size[1] = 0;
    if (bsize >= BLOCK_8X8 && cm->allow_screen_content_tools)
      read_palette_mode_info(cm, xd, r);
  #endif  // CONFIG_PALETTE
  #if CONFIG_FILTER_INTRA
    mbmi->filter_intra_mode_info.use_filter_intra_mode[0] = 0;
    mbmi->filter_intra_mode_info.use_filter_intra_mode[1] = 0;
    if (bsize >= BLOCK_8X8) read_filter_intra_mode_info(cm, xd, r);
  #endif  // CONFIG_FILTER_INTRA
  }
  
  static INLINE int is_mv_valid(const MV *mv) {
    return mv->row > MV_LOW && mv->row < MV_UPP && mv->col > MV_LOW &&
           mv->col < MV_UPP;
  }
  
  static INLINE int assign_mv(AV1_COMMON *cm, MACROBLOCKD *xd,
                              PREDICTION_MODE mode,
                              MV_REFERENCE_FRAME ref_frame[2], int block,
                              int_mv mv[2], int_mv ref_mv[2],
                              int_mv nearest_mv[2], int_mv near_mv[2],
                              int is_compound, int allow_hp, aom_reader *r) {
    int i;
    int ret = 1;
  #if CONFIG_REF_MV
    MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
    BLOCK_SIZE bsize = mbmi->sb_type;
    int_mv *pred_mv =
        (bsize >= BLOCK_8X8) ? mbmi->pred_mv : xd->mi[0]->bmi[block].pred_mv;
  #else
    (void)block;
  #endif
    (void)ref_frame;
  
    switch (mode) {
  #if CONFIG_EXT_INTER
      case NEWFROMNEARMV:
  #endif  // CONFIG_EXT_INTER
      case NEWMV: {
        FRAME_COUNTS *counts = xd->counts;
  #if !CONFIG_REF_MV
        nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
  #endif
        for (i = 0; i < 1 + is_compound; ++i) {
  #if CONFIG_REF_MV
          int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
          int nmv_ctx =
              av1_nmv_ctx(xd->ref_mv_count[rf_type], xd->ref_mv_stack[rf_type], i,
                          mbmi->ref_mv_idx);
          nmv_context_counts *const mv_counts =
              counts ? &counts->mv[nmv_ctx] : NULL;
          read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &cm->fc->nmvc[nmv_ctx],
                  mv_counts, allow_hp);
  #else
          read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &cm->fc->nmvc, mv_counts,
                  allow_hp);
  #endif
          ret = ret && is_mv_valid(&mv[i].as_mv);
  
  #if CONFIG_REF_MV
          pred_mv[i].as_int = ref_mv[i].as_int;
  #endif
        }
        break;
      }
      case NEARESTMV: {
        mv[0].as_int = nearest_mv[0].as_int;
        if (is_compound) mv[1].as_int = nearest_mv[1].as_int;
  
  #if CONFIG_REF_MV
        pred_mv[0].as_int = nearest_mv[0].as_int;
        if (is_compound) pred_mv[1].as_int = nearest_mv[1].as_int;
  #endif
        break;
      }
      case NEARMV: {
        mv[0].as_int = near_mv[0].as_int;
        if (is_compound) mv[1].as_int = near_mv[1].as_int;
  
  #if CONFIG_REF_MV
        pred_mv[0].as_int = near_mv[0].as_int;
        if (is_compound) pred_mv[1].as_int = near_mv[1].as_int;
  #endif
        break;
      }
      case ZEROMV: {
  #if CONFIG_GLOBAL_MOTION
        mv[0].as_int =
            gm_get_motion_vector(&cm->global_motion[ref_frame[0]]).as_int;
        if (is_compound)
          mv[1].as_int =
              gm_get_motion_vector(&cm->global_motion[ref_frame[1]]).as_int;
  #else
        mv[0].as_int = 0;
        if (is_compound) mv[1].as_int = 0;
  #endif  // CONFIG_GLOBAL_MOTION
  
  #if CONFIG_REF_MV
        pred_mv[0].as_int = 0;
        if (is_compound) pred_mv[1].as_int = 0;
  #endif
        break;
      }
  #if CONFIG_EXT_INTER
      case NEW_NEWMV: {
        FRAME_COUNTS *counts = xd->counts;
  #if !CONFIG_REF_MV
        nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
  #endif
        assert(is_compound);
        for (i = 0; i < 2; ++i) {
  #if CONFIG_REF_MV
          int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
          int nmv_ctx =
              av1_nmv_ctx(xd->ref_mv_count[rf_type], xd->ref_mv_stack[rf_type], i,
                          mbmi->ref_mv_idx);
          nmv_context_counts *const mv_counts =
              counts ? &counts->mv[nmv_ctx] : NULL;
          read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &cm->fc->nmvc[nmv_ctx],
                  mv_counts, allow_hp);
  #else
          read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &cm->fc->nmvc, mv_counts,
                  allow_hp);
  #endif
          ret = ret && is_mv_valid(&mv[i].as_mv);
        }
        break;
      }
      case NEAREST_NEARESTMV: {
        assert(is_compound);
        mv[0].as_int = nearest_mv[0].as_int;
        mv[1].as_int = nearest_mv[1].as_int;
        break;
      }
      case NEAREST_NEARMV: {
        assert(is_compound);
        mv[0].as_int = nearest_mv[0].as_int;
        mv[1].as_int = near_mv[1].as_int;
        break;
      }
      case NEAR_NEARESTMV: {
        assert(is_compound);
        mv[0].as_int = near_mv[0].as_int;
        mv[1].as_int = nearest_mv[1].as_int;
        break;
      }
      case NEAR_NEARMV: {
        assert(is_compound);
        mv[0].as_int = near_mv[0].as_int;
        mv[1].as_int = near_mv[1].as_int;
        break;
      }
      case NEW_NEARESTMV: {
        FRAME_COUNTS *counts = xd->counts;
  #if CONFIG_REF_MV
        int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
        int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                  xd->ref_mv_stack[rf_type], 0, mbmi->ref_mv_idx);
        nmv_context_counts *const mv_counts =
            counts ? &counts->mv[nmv_ctx] : NULL;
        read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &cm->fc->nmvc[nmv_ctx],
                mv_counts, allow_hp);
  #else
        nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
        read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &cm->fc->nmvc, mv_counts,
                allow_hp);
  #endif
        assert(is_compound);
        ret = ret && is_mv_valid(&mv[0].as_mv);
        mv[1].as_int = nearest_mv[1].as_int;
        break;
      }
      case NEAREST_NEWMV: {
        FRAME_COUNTS *counts = xd->counts;
  #if CONFIG_REF_MV
        int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
        int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                  xd->ref_mv_stack[rf_type], 1, mbmi->ref_mv_idx);
        nmv_context_counts *const mv_counts =
            counts ? &counts->mv[nmv_ctx] : NULL;
        mv[0].as_int = nearest_mv[0].as_int;
        read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &cm->fc->nmvc[nmv_ctx],
                mv_counts, allow_hp);
  #else
        nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
        mv[0].as_int = nearest_mv[0].as_int;
        read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &cm->fc->nmvc, mv_counts,
                allow_hp);
  #endif
        assert(is_compound);
        ret = ret && is_mv_valid(&mv[1].as_mv);
        break;
      }
      case NEAR_NEWMV: {
        FRAME_COUNTS *counts = xd->counts;
  #if CONFIG_REF_MV
        int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
        int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                  xd->ref_mv_stack[rf_type], 1, mbmi->ref_mv_idx);
        nmv_context_counts *const mv_counts =
            counts ? &counts->mv[nmv_ctx] : NULL;
        mv[0].as_int = near_mv[0].as_int;
        read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &cm->fc->nmvc[nmv_ctx],
                mv_counts, allow_hp);
  #else
        nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
        mv[0].as_int = near_mv[0].as_int;
        read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &cm->fc->nmvc, mv_counts,
                allow_hp);
  #endif
        assert(is_compound);
  
        ret = ret && is_mv_valid(&mv[1].as_mv);
        break;
      }
      case NEW_NEARMV: {
        FRAME_COUNTS *counts = xd->counts;
  #if CONFIG_REF_MV
        int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
        int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                  xd->ref_mv_stack[rf_type], 0, mbmi->ref_mv_idx);
        nmv_context_counts *const mv_counts =
            counts ? &counts->mv[nmv_ctx] : NULL;
        read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &cm->fc->nmvc[nmv_ctx],
                mv_counts, allow_hp);
  #else
        nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
        read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &cm->fc->nmvc, mv_counts,
                allow_hp);
  #endif
        assert(is_compound);
        ret = ret && is_mv_valid(&mv[0].as_mv);
        mv[1].as_int = near_mv[1].as_int;
        break;
      }
      case ZERO_ZEROMV: {
        assert(is_compound);
        mv[0].as_int = 0;
        mv[1].as_int = 0;
        break;
      }
  #endif  // CONFIG_EXT_INTER
      default: { return 0; }
    }
    return ret;
  }
  
  static int read_is_inter_block(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                 int segment_id, aom_reader *r) {
    if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
      return get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME) != INTRA_FRAME;
    } else {
      const int ctx = av1_get_intra_inter_context(xd);
      const int is_inter = aom_read(r, cm->fc->intra_inter_prob[ctx], ACCT_STR);
      FRAME_COUNTS *counts = xd->counts;
      if (counts) ++counts->intra_inter[ctx][is_inter];
      return is_inter;
    }
  }
  
  static void fpm_sync(void *const data, int mi_row) {
    AV1Decoder *const pbi = (AV1Decoder *)data;
    av1_frameworker_wait(pbi->frame_worker_owner, pbi->common.prev_frame,
                         mi_row << pbi->common.mib_size_log2);
  }
  
  static void read_inter_block_mode_info(AV1Decoder *const pbi,
                                         MACROBLOCKD *const xd,
                                         MODE_INFO *const mi,
  #if (CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION || CONFIG_EXT_INTER) && \
      CONFIG_SUPERTX
                                         int mi_row, int mi_col, aom_reader *r,
                                         int supertx_enabled) {
  #else
                                         int mi_row, int mi_col, aom_reader *r) {
  #endif  // CONFIG_MOTION_VAR && CONFIG_SUPERTX
    AV1_COMMON *const cm = &pbi->common;
    MB_MODE_INFO *const mbmi = &mi->mbmi;
    const BLOCK_SIZE bsize = mbmi->sb_type;
    const int allow_hp = cm->allow_high_precision_mv;
    int_mv nearestmv[2], nearmv[2];
    int_mv ref_mvs[MODE_CTX_REF_FRAMES][MAX_MV_REF_CANDIDATES];
  #if CONFIG_EXT_INTER
    int mv_idx;
  #endif  // CONFIG_EXT_INTER
    int ref, is_compound;
    int16_t inter_mode_ctx[MODE_CTX_REF_FRAMES];
  #if CONFIG_REF_MV && CONFIG_EXT_INTER
    int16_t compound_inter_mode_ctx[MODE_CTX_REF_FRAMES];
  #endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
    int16_t mode_ctx = 0;
    MV_REFERENCE_FRAME ref_frame;
  
  #if CONFIG_PALETTE
    mbmi->palette_mode_info.palette_size[0] = 0;
    mbmi->palette_mode_info.palette_size[1] = 0;
  #endif  // CONFIG_PALETTE
  
    read_ref_frames(cm, xd, r, mbmi->segment_id, mbmi->ref_frame);
    is_compound = has_second_ref(mbmi);
  
    for (ref = 0; ref < 1 + is_compound; ++ref) {
      MV_REFERENCE_FRAME frame = mbmi->ref_frame[ref];
      RefBuffer *ref_buf = &cm->frame_refs[frame - LAST_FRAME];
  
      xd->block_refs[ref] = ref_buf;
      if ((!av1_is_valid_scale(&ref_buf->sf)))
        aom_internal_error(xd->error_info, AOM_CODEC_UNSUP_BITSTREAM,
                           "Reference frame has invalid dimensions");
      av1_setup_pre_planes(xd, ref, ref_buf->buf, mi_row, mi_col, &ref_buf->sf);
    }
  
    for (ref_frame = LAST_FRAME; ref_frame < MODE_CTX_REF_FRAMES; ++ref_frame) {
      av1_find_mv_refs(cm, xd, mi, ref_frame,
  #if CONFIG_REF_MV
                       &xd->ref_mv_count[ref_frame], xd->ref_mv_stack[ref_frame],
  #if CONFIG_EXT_INTER
                       compound_inter_mode_ctx,
  #endif  // CONFIG_EXT_INTER
  #endif
                       ref_mvs[ref_frame], mi_row, mi_col, fpm_sync, (void *)pbi,
                       inter_mode_ctx);
    }
  
  #if CONFIG_REF_MV
    for (; ref_frame < MODE_CTX_REF_FRAMES; ++ref_frame) {
      av1_find_mv_refs(cm, xd, mi, ref_frame, &xd->ref_mv_count[ref_frame],
                       xd->ref_mv_stack[ref_frame],
  #if CONFIG_EXT_INTER
                       compound_inter_mode_ctx,
  #endif  // CONFIG_EXT_INTER
                       ref_mvs[ref_frame], mi_row, mi_col, fpm_sync, (void *)pbi,
                       inter_mode_ctx);
  
      if (xd->ref_mv_count[ref_frame] < 2) {
        MV_REFERENCE_FRAME rf[2];
        av1_set_ref_frame(rf, ref_frame);
        for (ref = 0; ref < 2; ++ref) {
          lower_mv_precision(&ref_mvs[rf[ref]][0].as_mv, allow_hp);
          lower_mv_precision(&ref_mvs[rf[ref]][1].as_mv, allow_hp);
        }
  
        if (ref_mvs[rf[0]][0].as_int != 0 || ref_mvs[rf[0]][1].as_int != 0 ||
            ref_mvs[rf[1]][0].as_int != 0 || ref_mvs[rf[1]][1].as_int != 0)
          inter_mode_ctx[ref_frame] &= ~(1 << ALL_ZERO_FLAG_OFFSET);
      }
    }
  
  #if CONFIG_EXT_INTER
    if (is_compound)
      mode_ctx = compound_inter_mode_ctx[mbmi->ref_frame[0]];
    else
  #endif  // CONFIG_EXT_INTER
      mode_ctx =
          av1_mode_context_analyzer(inter_mode_ctx, mbmi->ref_frame, bsize, -1);
    mbmi->ref_mv_idx = 0;
  #else
    mode_ctx = inter_mode_ctx[mbmi->ref_frame[0]];
  #endif
  
    if (segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
      mbmi->mode = ZEROMV;
      if (bsize < BLOCK_8X8) {
        aom_internal_error(xd->error_info, AOM_CODEC_UNSUP_BITSTREAM,
                           "Invalid usage of segement feature on small blocks");
        return;
      }
    } else {
      if (bsize >= BLOCK_8X8) {
  #if CONFIG_EXT_INTER
        if (is_compound)
          mbmi->mode = read_inter_compound_mode(cm, xd, r, mode_ctx);
        else
  #endif  // CONFIG_EXT_INTER
          mbmi->mode = read_inter_mode(cm, xd,
  #if CONFIG_REF_MV && CONFIG_EXT_INTER
                                       mbmi,
  #endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
                                       r, mode_ctx);
  #if CONFIG_REF_MV
        if (mbmi->mode == NEARMV || mbmi->mode == NEWMV)
          read_drl_idx(cm, xd, mbmi, r);
  #endif
      }
    }
  
  #if CONFIG_EXT_INTER
    if (bsize < BLOCK_8X8 ||
        (mbmi->mode != ZEROMV && mbmi->mode != ZERO_ZEROMV)) {
  #else
    if (bsize < BLOCK_8X8 || mbmi->mode != ZEROMV) {
  #endif  // CONFIG_EXT_INTER
      for (ref = 0; ref < 1 + is_compound; ++ref) {
        av1_find_best_ref_mvs(allow_hp, ref_mvs[mbmi->ref_frame[ref]],
                              &nearestmv[ref], &nearmv[ref]);
      }
    }
  
  #if CONFIG_REF_MV
    if (mbmi->ref_mv_idx > 0) {
      int_mv cur_mv =
          xd->ref_mv_stack[mbmi->ref_frame[0]][1 + mbmi->ref_mv_idx].this_mv;
      nearmv[0] = cur_mv;
    }
  
  #if CONFIG_EXT_INTER
    if (is_compound && bsize >= BLOCK_8X8 && mbmi->mode != ZERO_ZEROMV) {
  #else
    if (is_compound && bsize >= BLOCK_8X8 && mbmi->mode != NEWMV &&
        mbmi->mode != ZEROMV) {
  #endif  // CONFIG_EXT_INTER
      uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
  
  #if CONFIG_EXT_INTER
      if (xd->ref_mv_count[ref_frame_type] > 0) {
  #else
      if (xd->ref_mv_count[ref_frame_type] == 1 && mbmi->mode == NEARESTMV) {
  #endif  // CONFIG_EXT_INTER
  #if CONFIG_EXT_INTER
        if (mbmi->mode == NEAREST_NEARESTMV) {
  #endif  // CONFIG_EXT_INTER
          nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;
          nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
          lower_mv_precision(&nearestmv[0].as_mv, allow_hp);
          lower_mv_precision(&nearestmv[1].as_mv, allow_hp);
  #if CONFIG_EXT_INTER
        } else if (mbmi->mode == NEAREST_NEWMV || mbmi->mode == NEAREST_NEARMV) {
          nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;
          lower_mv_precision(&nearestmv[0].as_mv, allow_hp);
        } else if (mbmi->mode == NEW_NEARESTMV || mbmi->mode == NEAR_NEARESTMV) {
          nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
          lower_mv_precision(&nearestmv[1].as_mv, allow_hp);
        }
  #endif  // CONFIG_EXT_INTER
      }
  
  #if CONFIG_EXT_INTER
      if (xd->ref_mv_count[ref_frame_type] > 1) {
        if (mbmi->mode == NEAR_NEWMV || mbmi->mode == NEAR_NEARESTMV ||
            mbmi->mode == NEAR_NEARMV) {
          nearmv[0] = xd->ref_mv_stack[ref_frame_type][1].this_mv;
          lower_mv_precision(&nearmv[0].as_mv, allow_hp);
        }
  
        if (mbmi->mode == NEW_NEARMV || mbmi->mode == NEAREST_NEARMV ||
            mbmi->mode == NEAR_NEARMV) {
          nearmv[1] = xd->ref_mv_stack[ref_frame_type][1].comp_mv;
          lower_mv_precision(&nearmv[1].as_mv, allow_hp);
        }
      }
  #else
      if (xd->ref_mv_count[ref_frame_type] > 1) {
        int ref_mv_idx = 1 + mbmi->ref_mv_idx;
        nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;
        nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
        nearmv[0] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].this_mv;
        nearmv[1] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].comp_mv;
      }
  #endif  // CONFIG_EXT_INTER
    }
  #endif
  
  #if !CONFIG_EXT_INTERP && !CONFIG_DUAL_FILTER
    mbmi->interp_filter = read_interp_filter(cm, xd, r);
  #endif  // !CONFIG_EXT_INTERP && !CONFIG_DUAL_FILTER
  
    if (bsize < BLOCK_8X8) {
      const int num_4x4_w = 1 << xd->bmode_blocks_wl;
      const int num_4x4_h = 1 << xd->bmode_blocks_hl;
      int idx, idy;
      PREDICTION_MODE b_mode;
      int_mv nearest_sub8x8[2], near_sub8x8[2];
  #if CONFIG_EXT_INTER
      int_mv ref_mv[2][2];
  #endif  // CONFIG_EXT_INTER
      for (idy = 0; idy < 2; idy += num_4x4_h) {
        for (idx = 0; idx < 2; idx += num_4x4_w) {
          int_mv block[2];
          const int j = idy * 2 + idx;
          int_mv ref_mv_s8[2];
  #if CONFIG_REF_MV
  #if CONFIG_EXT_INTER
          if (!is_compound)
  #endif  // CONFIG_EXT_INTER
            mode_ctx = av1_mode_context_analyzer(inter_mode_ctx, mbmi->ref_frame,
                                                 bsize, j);
  #endif
  #if CONFIG_EXT_INTER
          if (is_compound)
            b_mode = read_inter_compound_mode(cm, xd, r, mode_ctx);
          else
  #endif  // CONFIG_EXT_INTER
            b_mode = read_inter_mode(cm, xd,
  #if CONFIG_REF_MV && CONFIG_EXT_INTER
                                     mbmi,
  #endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
                                     r, mode_ctx);
  
  #if CONFIG_EXT_INTER
          mv_idx = (b_mode == NEWFROMNEARMV) ? 1 : 0;
  
          if (b_mode != ZEROMV && b_mode != ZERO_ZEROMV) {
  #else
          if (b_mode != ZEROMV) {
  #endif  // CONFIG_EXT_INTER
  #if CONFIG_REF_MV
            CANDIDATE_MV ref_mv_stack[2][MAX_REF_MV_STACK_SIZE];
            uint8_t ref_mv_count[2];
  #endif
            for (ref = 0; ref < 1 + is_compound; ++ref)
  #if CONFIG_EXT_INTER
            {
              int_mv mv_ref_list[MAX_MV_REF_CANDIDATES];
              av1_update_mv_context(xd, mi, mbmi->ref_frame[ref], mv_ref_list, j,
                                    mi_row, mi_col, NULL);
  #endif  // CONFIG_EXT_INTER
              av1_append_sub8x8_mvs_for_idx(cm, xd, j, ref, mi_row, mi_col,
  #if CONFIG_REF_MV
                                            ref_mv_stack[ref], &ref_mv_count[ref],
  #endif
  #if CONFIG_EXT_INTER
                                            mv_ref_list,
  #endif  // CONFIG_EXT_INTER
                                            &nearest_sub8x8[ref],
                                            &near_sub8x8[ref]);
  #if CONFIG_EXT_INTER
              if (have_newmv_in_inter_mode(b_mode)) {
                mv_ref_list[0].as_int = nearest_sub8x8[ref].as_int;
                mv_ref_list[1].as_int = near_sub8x8[ref].as_int;
                av1_find_best_ref_mvs(allow_hp, mv_ref_list, &ref_mv[0][ref],
                                      &ref_mv[1][ref]);
              }
            }
  #endif  // CONFIG_EXT_INTER
          }
  
          for (ref = 0; ref < 1 + is_compound && b_mode != ZEROMV; ++ref) {
  #if CONFIG_REF_MV
            ref_mv_s8[ref] = nearest_sub8x8[ref];
            lower_mv_precision(&ref_mv_s8[ref].as_mv, allow_hp);
  #else
            ref_mv_s8[ref] = nearestmv[ref];
  #endif
          }
  #if CONFIG_EXT_INTER
          (void)ref_mv_s8;
  #endif
  
          if (!assign_mv(cm, xd, b_mode, mbmi->ref_frame, j, block,
  #if CONFIG_EXT_INTER
                         ref_mv[mv_idx],
  #else
                         ref_mv_s8,
  #endif  // CONFIG_EXT_INTER
                         nearest_sub8x8, near_sub8x8, is_compound, allow_hp, r)) {
            xd->corrupted |= 1;
            break;
          };
  
          mi->bmi[j].as_mv[0].as_int = block[0].as_int;
          mi->bmi[j].as_mode = b_mode;
          if (is_compound) mi->bmi[j].as_mv[1].as_int = block[1].as_int;
  
          if (num_4x4_h == 2) mi->bmi[j + 2] = mi->bmi[j];
          if (num_4x4_w == 2) mi->bmi[j + 1] = mi->bmi[j];
        }
      }
  
  #if CONFIG_REF_MV
      mbmi->pred_mv[0].as_int = mi->bmi[3].pred_mv[0].as_int;
      mbmi->pred_mv[1].as_int = mi->bmi[3].pred_mv[1].as_int;
  #endif
      mi->mbmi.mode = b_mode;
  
      mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
      mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
    } else {
      int_mv ref_mv[2];
      ref_mv[0] = nearestmv[0];
      ref_mv[1] = nearestmv[1];
  
      for (ref = 0; ref < 1 + is_compound && mbmi->mode == NEWMV; ++ref) {
  #if CONFIG_REF_MV
        uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
        if (xd->ref_mv_count[ref_frame_type] > 1) {
          ref_mv[ref] =
              (ref == 0)
                  ? xd->ref_mv_stack[ref_frame_type][mbmi->ref_mv_idx].this_mv
                  : xd->ref_mv_stack[ref_frame_type][mbmi->ref_mv_idx].comp_mv;
          clamp_mv_ref(&ref_mv[ref].as_mv, xd->n8_w << 3, xd->n8_h << 3, xd);
        }
  #endif
        nearestmv[ref] = ref_mv[ref];
      }
  
      xd->corrupted |=
          !assign_mv(cm, xd, mbmi->mode, mbmi->ref_frame, 0, mbmi->mv,
  #if CONFIG_EXT_INTER
                     mbmi->mode == NEWFROMNEARMV ? nearmv : nearestmv,
  #else
                     ref_mv,
  #endif  // CONFIG_EXT_INTER
                     nearestmv, nearmv, is_compound, allow_hp, r);
    }
  
  #if CONFIG_EXT_INTER
    mbmi->use_wedge_interintra = 0;
    if (cm->reference_mode != COMPOUND_REFERENCE &&
  #if CONFIG_SUPERTX
        !supertx_enabled &&
  #endif
        is_interintra_allowed(mbmi)) {
      const int bsize_group = size_group_lookup[bsize];
      const int interintra =
          aom_read(r, cm->fc->interintra_prob[bsize_group], ACCT_STR);
      if (xd->counts) xd->counts->interintra[bsize_group][interintra]++;
      assert(mbmi->ref_frame[1] == NONE);
      if (interintra) {
        const INTERINTRA_MODE interintra_mode =
            read_interintra_mode(cm, xd, r, bsize_group);
        mbmi->ref_frame[1] = INTRA_FRAME;
        mbmi->interintra_mode = interintra_mode;
  #if CONFIG_EXT_INTRA
        mbmi->angle_delta[0] = 0;
        mbmi->angle_delta[1] = 0;
        mbmi->intra_filter = INTRA_FILTER_LINEAR;
  #endif  // CONFIG_EXT_INTRA
  #if CONFIG_FILTER_INTRA
        mbmi->filter_intra_mode_info.use_filter_intra_mode[0] = 0;
        mbmi->filter_intra_mode_info.use_filter_intra_mode[1] = 0;
  #endif  // CONFIG_FILTER_INTRA
        if (is_interintra_wedge_used(bsize)) {
          mbmi->use_wedge_interintra =
              aom_read(r, cm->fc->wedge_interintra_prob[bsize], ACCT_STR);
          if (xd->counts)
            xd->counts->wedge_interintra[bsize][mbmi->use_wedge_interintra]++;
          if (mbmi->use_wedge_interintra) {
            mbmi->interintra_wedge_index =
                aom_read_literal(r, get_wedge_bits_lookup(bsize), ACCT_STR);
            mbmi->interintra_wedge_sign = 0;
          }
        }
      }
    }
  #endif  // CONFIG_EXT_INTER
  
  #if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
    mbmi->motion_mode = SIMPLE_TRANSLATION;
  #if CONFIG_SUPERTX
    if (!supertx_enabled)
  #endif  // CONFIG_SUPERTX
  #if CONFIG_EXT_INTER
      if (mbmi->ref_frame[1] != INTRA_FRAME)
  #endif  // CONFIG_EXT_INTER
        mbmi->motion_mode = read_motion_mode(cm, xd, mbmi, r);
  #endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
  
  #if CONFIG_EXT_INTER
    mbmi->use_wedge_interinter = 0;
    if (cm->reference_mode != SINGLE_REFERENCE &&
        is_inter_compound_mode(mbmi->mode) &&
  #if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
        !(is_motion_variation_allowed(mbmi) &&
          mbmi->motion_mode != SIMPLE_TRANSLATION) &&
  #endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
        is_interinter_wedge_used(bsize)) {
      mbmi->use_wedge_interinter =
          aom_read(r, cm->fc->wedge_interinter_prob[bsize], ACCT_STR);
      if (xd->counts)
        xd->counts->wedge_interinter[bsize][mbmi->use_wedge_interinter]++;
      if (mbmi->use_wedge_interinter) {
        mbmi->interinter_wedge_index =
            aom_read_literal(r, get_wedge_bits_lookup(bsize), ACCT_STR);
        mbmi->interinter_wedge_sign = aom_read_bit(r, ACCT_STR);
      }
    }
  #endif  // CONFIG_EXT_INTER
  
  #if CONFIG_DUAL_FILTER
    for (ref = 0; ref < 2; ++ref) {
      mbmi->interp_filter[ref] = (cm->interp_filter == SWITCHABLE)
                                     ? EIGHTTAP_REGULAR
                                     : cm->interp_filter;
  
      if (has_subpel_mv_component(xd->mi[0], xd, ref) ||
          (mbmi->ref_frame[1] > INTRA_FRAME &&
           has_subpel_mv_component(xd->mi[0], xd, ref + 2)))
        mbmi->interp_filter[ref] = read_interp_filter(cm, xd, ref, r);
    }
    // The index system worsk as:
    // (0, 1) -> (vertical, horizontal) filter types for the first ref frame.
    // (2, 3) -> (vertical, horizontal) filter types for the second ref frame.
    mbmi->interp_filter[2] = mbmi->interp_filter[0];
    mbmi->interp_filter[3] = mbmi->interp_filter[1];
  #else
  #if CONFIG_EXT_INTERP
    mbmi->interp_filter = read_interp_filter(cm, xd, r);
  #endif  // CONFIG_EXT_INTERP
  #endif  // CONFIG_DUAL_FILTER
  }
  
  static void read_inter_frame_mode_info(AV1Decoder *const pbi,
                                         MACROBLOCKD *const xd,
  #if CONFIG_SUPERTX
                                         int supertx_enabled,
  #endif  // CONFIG_SUPERTX
                                         int mi_row, int mi_col, aom_reader *r) {
    AV1_COMMON *const cm = &pbi->common;
    MODE_INFO *const mi = xd->mi[0];
    MB_MODE_INFO *const mbmi = &mi->mbmi;
    int inter_block = 1;
  #if CONFIG_VAR_TX
    BLOCK_SIZE bsize = mbmi->sb_type;
  #endif  // CONFIG_VAR_TX
  
    mbmi->mv[0].as_int = 0;
    mbmi->mv[1].as_int = 0;
    mbmi->segment_id = read_inter_segment_id(cm, xd, mi_row, mi_col, r);
  #if CONFIG_SUPERTX
    if (!supertx_enabled) {
  #endif  // CONFIG_SUPERTX
      mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);
  #if CONFIG_DELTA_Q
      if (cm->delta_q_present_flag) {
        xd->current_qindex =
            xd->prev_qindex +
            read_delta_qindex(cm, xd, r, mbmi, mi_col, mi_row) * cm->delta_q_res;
        xd->prev_qindex = xd->current_qindex;
      }
  #endif
      inter_block = read_is_inter_block(cm, xd, mbmi->segment_id, r);
  
  #if CONFIG_VAR_TX
      xd->above_txfm_context = cm->above_txfm_context + mi_col;
      xd->left_txfm_context =
          xd->left_txfm_context_buffer + (mi_row & MAX_MIB_MASK);
      if (bsize >= BLOCK_8X8 && cm->tx_mode == TX_MODE_SELECT && !mbmi->skip &&
          inter_block) {
        const TX_SIZE max_tx_size = max_txsize_lookup[bsize];
        const int bh = tx_size_high_unit[max_tx_size];
        const int bw = tx_size_wide_unit[max_tx_size];
        const int width = block_size_wide[bsize] >> tx_size_wide_log2[0];
        const int height = block_size_high[bsize] >> tx_size_wide_log2[0];
        int idx, idy;
  #if CONFIG_EXT_TX && CONFIG_RECT_TX
        int is_rect_tx_allowed = inter_block && is_rect_tx_allowed_bsize(bsize) &&
                                 !xd->lossless[mbmi->segment_id];
        int use_rect_tx = 0;
        int tx_size_cat = inter_tx_size_cat_lookup[bsize];
        if (is_rect_tx_allowed) {
          use_rect_tx = aom_read(r, cm->fc->rect_tx_prob[tx_size_cat], ACCT_STR);
          if (xd->counts) {
            ++xd->counts->rect_tx[tx_size_cat][use_rect_tx];
          }
        }
  
        if (use_rect_tx) {
          mbmi->tx_size = max_txsize_rect_lookup[bsize];
          set_txfm_ctxs(mbmi->tx_size, xd->n8_w, xd->n8_h, xd);
        } else {
  #endif  // CONFIG_EXT_TX && CONFIG_RECT_TX
          mbmi->min_tx_size = TX_SIZES_ALL;
          for (idy = 0; idy < height; idy += bh)
            for (idx = 0; idx < width; idx += bw)
              read_tx_size_vartx(cm, xd, mbmi, xd->counts, max_tx_size,
                                 height != width, idy, idx, r);
  #if CONFIG_EXT_TX && CONFIG_RECT_TX
        }
  #endif
      } else {
        if (inter_block)
          mbmi->tx_size = read_tx_size_inter(cm, xd, !mbmi->skip, r);
        else
          mbmi->tx_size = read_tx_size_intra(cm, xd, r);
  
        if (inter_block) {
          const int width = num_4x4_blocks_wide_lookup[bsize];
          const int height = num_4x4_blocks_high_lookup[bsize];
          int idx, idy;
          for (idy = 0; idy < height; ++idy)
            for (idx = 0; idx < width; ++idx)
              mbmi->inter_tx_size[idy >> 1][idx >> 1] = mbmi->tx_size;
        }
        mbmi->min_tx_size = get_min_tx_size(mbmi->tx_size);
        set_txfm_ctxs(mbmi->tx_size, xd->n8_w, xd->n8_h, mbmi->skip, xd);
      }
  #else
    if (inter_block)
      mbmi->tx_size = read_tx_size_inter(cm, xd, !mbmi->skip, r);
    else
      mbmi->tx_size = read_tx_size_intra(cm, xd, r);
  #endif  // CONFIG_VAR_TX
  #if CONFIG_SUPERTX
    }
  #if CONFIG_VAR_TX
    else if (inter_block) {
      const int width = num_4x4_blocks_wide_lookup[bsize];
      const int height = num_4x4_blocks_high_lookup[bsize];
      int idx, idy;
      xd->mi[0]->mbmi.tx_size = xd->supertx_size;
      for (idy = 0; idy < height; ++idy)
        for (idx = 0; idx < width; ++idx)
          xd->mi[0]->mbmi.inter_tx_size[idy >> 1][idx >> 1] = xd->supertx_size;
    }
  #endif  // CONFIG_VAR_TX
  #endif  // CONFIG_SUPERTX
  
    if (inter_block)
      read_inter_block_mode_info(pbi, xd,
  #if (CONFIG_MOTION_VAR || CONFIG_EXT_INTER || CONFIG_WARPED_MOTION) && \
      CONFIG_SUPERTX
  
                                 mi, mi_row, mi_col, r, supertx_enabled);
  #else
                                 mi, mi_row, mi_col, r);
  #endif  // CONFIG_MOTION_VAR && CONFIG_SUPERTX
    else
      read_intra_block_mode_info(cm, xd, mi, r);
  
    read_tx_type(cm, xd, mbmi,
  #if CONFIG_SUPERTX
                 supertx_enabled,
  #endif
                 r);
  }
  
  void av1_read_mode_info(AV1Decoder *const pbi, MACROBLOCKD *xd,
  #if CONFIG_SUPERTX
                          int supertx_enabled,
  #endif  // CONFIG_SUPERTX
                          int mi_row, int mi_col, aom_reader *r, int x_mis,
                          int y_mis) {
    AV1_COMMON *const cm = &pbi->common;
    MODE_INFO *const mi = xd->mi[0];
    MV_REF *frame_mvs = cm->cur_frame->mvs + mi_row * cm->mi_cols + mi_col;
    int w, h;
  
    if (frame_is_intra_only(cm)) {
      read_intra_frame_mode_info(cm, xd, mi_row, mi_col, r);
  #if CONFIG_REF_MV
      for (h = 0; h < y_mis; ++h) {
        MV_REF *const frame_mv = frame_mvs + h * cm->mi_cols;
        for (w = 0; w < x_mis; ++w) {
          MV_REF *const mv = frame_mv + w;
          mv->ref_frame[0] = NONE;
          mv->ref_frame[1] = NONE;
        }
      }
  #endif
    } else {
      read_inter_frame_mode_info(pbi, xd,
  #if CONFIG_SUPERTX
                                 supertx_enabled,
  #endif  // CONFIG_SUPERTX
                                 mi_row, mi_col, r);
      for (h = 0; h < y_mis; ++h) {
        MV_REF *const frame_mv = frame_mvs + h * cm->mi_cols;
        for (w = 0; w < x_mis; ++w) {
          MV_REF *const mv = frame_mv + w;
          mv->ref_frame[0] = mi->mbmi.ref_frame[0];
          mv->ref_frame[1] = mi->mbmi.ref_frame[1];
          mv->mv[0].as_int = mi->mbmi.mv[0].as_int;
          mv->mv[1].as_int = mi->mbmi.mv[1].as_int;
  #if CONFIG_REF_MV
          mv->pred_mv[0].as_int = mi->mbmi.pred_mv[0].as_int;
          mv->pred_mv[1].as_int = mi->mbmi.pred_mv[1].as_int;
  #endif
        }
      }
    }
  }
  